Patrick Grässle is the co-founder and board member of KnowGravity Inc. (http://www.knowgravity.com) in Zürich, a leading supplier of MDA and Business Rules know-how. Patrick studied Informatics and Economics at the University of Zürich. In 1986, he built his first model of an IT system using structured analysis and did not stop modeling since then. He has applied UML in many projects. He used and consulted structured and object-oriented methods for system specification. In the nineties, he helped develop the first localized UML trainings in Switzerland. The UML-based 'Model Driven Architecture' and the 'Business Rules Approach' absorb his main interest nowadays, but he is still doing UML training and consulting.